Draft control damper



1949. R. WILSON DRAFT CONTROL DAMPER Filed May '7, 1945 INVE NTOR. fi05e7'Z ZZ/Lleom 3% ,meu

Patented Feb. 8, 1949 encased J nanr'rrcon'rnonfnmenm lt'obert Wil'song Holland, Mich assignor to HallandzFurnaceaGompa-nx; Holland;

poration ofinelaware Mich, accr Applination-May 7;,1945, Serial No. 5925509;

This invention relates toadraft control damper and more particularly to a dampenthat is controlled primarily 'bytheamount of suction-in the flue; and may also-be opened manually-or mechanically by means permitting further" opening of the damper by the-flue'suction if'the latter predominates-thereover.

Among the obj ectsof my invention are: topro vide-a novel and improved draft'control damper; to provide a draft control damper-in" which there is embodied a novel-means for positively=and=selectively assisting the opening of the damper manually or mechanically without interfering withfurtheropening by the suction in-the flueshould the latter predominate; to-providea novel arrangement of 'operatingpartsfor adraft control damper; to provide; a novel arrangement ofdamper and weights therefor;- and to provide a novel mounting-means-for a dampers Other objects, advantages and capabilitieg'inherently possessed by my invention; will appear more-'fullyfrom the following'detailed description taken in connection with the accompanying drawings. Y

Inthedrawings: i

Fig. 1 is afrontselevation-ofia draftcontroP damper means embodying my: invention;

Fig. 2is an: edge: elevation. of the'-fi'-ame-:and the damper. with:v its associated parts;- the pipe 'lead'. ing: tothe smoke-.pipebeing. Shown in: central" ver ticalsectiom I i I Fig. 3l.is-' avvertical sectionthroughathe-linel3 -3- oi Fig. 1", but showing the damper as being-par tiallyzopenn j l Fig. 4-isa plamviewzwitha portionaoffthewframe: broken away: and: looking: from the; line-,- 42-42- of; Fig.- 11in: the direction ofithezarrowsz Fig; .55 is an enlarged fragmentary"section-along: theline 55-of-Fig;;1;, v v

While myiinvention' residessin the combination, construction andarrangementof partsillustratedi inithe drawing, I have shawnz thereim.forillixsatrative: purposes; a preferred: embodiment, and: wish it understood: that. the; sameris: susceptible of modification j and} change; wlthm1tc departing." 'rom thespirit-and;scope1ofjthe;appendedaclaims;

Refe ring more, im detail; to: the; drawings my;- novel; and improved..- draftt control.- damper? is mounted upon; the;- outer; end. of: a stub pipe .l'=, leading into the; side of arfiirnace smolcezpipei which connects; in the: usuali manner t'ozthe- -fl1le fora carrying away, the: smoker-andiproducts': of

trol': damper. lessens;- thez-fuellconsumpti nd: enables-a more efficient.andzcompletecombustiom in claims-. (01. ass-'45);

inthe fire box of thef-ur'nace by reason of the bottom portion of the" dam-perswinginginward-lye when the suction in the flue and smok'e 'pipe'is' such a s to"causesuchinward movement. A r-tame 3 is fixedly mounted in the outer" end 'ofthe pipe I and as seen in-Fig; 1 is inthe form- 0f a: ring having anouterannul'ar flange t'p referably abut ting against the outer edgepf th'e pipe; Ring-=3-'is-= formed at its inner edge-withnarrow; radiallyeex tending-annular flanges and 6, the-latten of which is positioned slight distanceforwardly or flange 5; Flange-Sterminates a distance above the center lineofpip'e F, while-flange 6' extends a distance above this center line on theleft hand side of Fig; L and short of this centerline an theright hand sidebf Fig. l. v

As seen in Figs. 1 "and- 2; ring "is annular at its for-Ward edgebut at each-of its two -sid'e"-edgesis= formed with a flattened inset portion 1 upon therear edges of Which-"the flange G ter-minates-at the difierent heights referred to'-' above; I Fixed by screws ort the like 8 t'o the'fiattened s'ides'lof the ring, upon each side thereof, is a fulcrum bracket- IO having a rearwardly extending ear H which ear is bent into a U shape to form the=outer imperforate wall l2: Eachof' thewall's l l i's formed with anelongate'd slot l havin'g a curved bottom edge, in. which elongated: slots are rollably and rockablyunountedlthe endsofithefulcrum r'od I 5:

v ccmbustiomfromthesfurnace; Thisztypeaofi con-M 55' ct: thezdamper'will be seated;'against or nean'tne- This rod is of suchlength thattits outer endsWill I be prevented from having any substantial longi-. tudinal movement by the'outer imperforatewalle l2i of the'bracketlears" H; Fixedrto; the ful'crum rod: this, a damper fi swingably mounted with;

relation to; the frames To. eflect'zthis mounting ofi FiXecLto' the damper l1: atH-a pointlatslight dis tance'. below; the fulcrum rod. and laterally: inthe::

centervv thereof.-,; is; an elongated screw; lafupom' which is threaded: a two-part weightivmemben 2 It which, upon rotation in one direction-"onTthe other; will be moved toward or away from the damper II? to adjust the tendency; of "the weight to; effect :by gravity a greater orlessclosing mov e; I

ment of: the damper. Adjacent the fulcrumirod l5: theadamper is. ofisetiorwardly at 212' soi'that" the upper ofiset'portion'awill be seated onor near the: front side: of flange 52 and the lbwer portion rear face of flange 6, when the damper is in vertical position. Fixed to the rear face of the upper oifset portion of the damper is a weight element 22, which at its outer edges is inset a slight distance from the top edge of the damper so as to permit said inset portion 23 to seat against or near flange when the damper is vertical.

Positioned outside of the frame or ring 3 is an arm 24 extending rearwardly and preferably at an angle downwardly, the upper end 25 of this arm extending to the inside of the forward edge of ring 3 and then extending rearwardly at 26 adjacent the inner face of the flattened portion 1. At its rear end this rearwardly ex- 9 of portion 26 of arm 24 is bent at right angles (Fig. 4) in the form of an extended arm 28, arcuate in shape, and at its far end bent to form a flange 29 which is provided with an aperture 30 rotatably receiving the fulcrum rod l5.

As seen in Fig. 3 the arcuate extension 28 of arm 24, when arm 24 is moved upwardly at its free end, presses against the inner face of the fixed weight 22 to move the upper side of the damper outwardly and the lower side inwardly. As will be understood in Fig. 3, this manual or mechanical movement of arm 24, to cause its inner extension 28 to press against the rear face of the top of the damper, will positively open the damper adesired amount, but will not prevent the damper from being open -a.further amount by suction in the flue if such suction is great enough to open the damper a greater amount than that afforded by the arm 24. The outer free end portion of arm 24 is provided with anysuitable number of apertures 3| throughv which may be connected the lower end of a chain, cord or other element (not shown) for moving arm 24 either manually or mechanically as desired. a

From the above it is seen that I have provided a novel arrangement of Weights, one of which may be adjusted as desired to effect desired balance of the damper with relation to the suction in the flue, and also a novel arrangement of parts by which the damper may be manually or mechanically opened a desired amount and the damper befree to open a greater amount should 1 the suction in the flue be sufficient to cause the damper to open to such greater amount. In other words, the manual or mechanical means for. opening the damper, effects such opening to a desired amountbut leaving the damper free to be;opened a greater amount should conditions in the fiue necessitate.

It is to be noted in Fig. 5 that the fulcrum rod 15 is rollably and rockably mounted at its two ends on the arcuate bottom edges of the two slots M in the ears II. This causes the ends of the fulcrum rod to roll toward'the forward end of slot 14 as the damper opens and to normally be seated in'the middle of the arcuate bottom edge of these slots w'hen the damper is vertical.

I claim:

l. A draft control damper comprising a frame, a fulcrum bracket on each side of the frame, each of said brackets having a U-shaped ear forming an outer imperforate wall and an inwardly spaced inner wall having an elongated slot with an arcuate concave bottom edge, a damper, a fulcrum rod fixed to said damper extending transversely thereof above'itsmiddle and having ends extending beyond the side edges of the damper, said extended ends passing through said slots and held against excess longitudinal movement by the imperforate outer walls and rollably mounted on said arcuate bottom edges of the slots, a control arm swingably mounted on the fulcrum rod and having an extended end outside of the frame, and a laterally spaced arm positioned inside of the frame, said latter arm being bent at an angle to extend arcuately across the inside of the frame and having at its extended end a flange rotatably mounted on the fulcrum arm whereby, when the outerrend of the control arm is moved in one direction, the arcuate extended inner end will bear againstthe inner face of the damper but permit the'damper to be further opened by an excess amount of suction in the flue, a weight fixed to the damper above its axis of rotation, and a weight carried by the damper and adjustably mounted for movement toward and away from the damper. I

2, A draft control damper comprising a frame, a fulcrum bracket on each side of the frame, each of said brackets having a U-shaped ear with an apertured inner wall and an imperforate outer wall, a damper, a fulcrum rod on said damper, said rod having extended ends each passing through one of the apertured inner walls of the ears and prevented from excess longitudinal movement by the imperforate outer walls, an angle arm having its free end outside of the frame and, its opposite end inside of the frame behind the damper, said opposite end being fulcrumed on the fulcrum rod and having a portion extending above the fulcrum rod, the aperture in each of said inner walls being in the form of an elliptical slot to provide a limited amount of rolling movement of the fulcrum rod ends in the slots.

3. A draft control damper comprising a frame adapted to be mounted in an opening leading to a furnace flue, a damper having fixed thereon above its middle a fulcrum rod extending beyond the side edges of the damper, means for mounting the extending ends of the rod to the frame so that the "damper may have swinging movement with relation to the frame, and an arm pivotally mounted on said rod and having an ex- .tension loosely contacting one face of the damper,

said damper having a fixed weight above and an adjustable weight below the fulcrum rod, said arm having its free end outside of the frame whereby movement of the arm in one direction will open the damper but permit further opening of the damper by suction in the flue.

4. A draft control'damper comprising a frame adapted to'be mountedin an opening leading to a furnace flu-e, a damper having fixed thereon above its middle a fulcrum rod extending beyond the side edges of the damper, means for mounting the extending ends of the rod to the frame so that the damper may have swinging movement' with relation to the frame, and an arm pivotally mounted on said rod and having an exsaid rod having extended ends each passing through one of the apertured inner walls of the ears and prevented from excess longitudinal movement by the imperforate outer walls, an angle arm having its free end outside of the frame and its opposite end inside of the frame behind the damper, said opposite end being fulcrumed on the fulcrum rod and having a portion extending above the fulcrum rod.

6. A draft control damp-er comprising a frame adapted to be mounted in an opening leading to a furnace smoke pipe, a damper swingably mounted in the frame on trunnions above the middle of the damper, and an arm member having an extension adapted to loosely contact one face of the damper, said damper and arm having a common axis of rotation on said trunnions; said trunnions having a limited amount of rolling movement forwardly and rearwardly of the frame, said arm having its free end outside of the frame whereby movement of the arm in one direction will open the damper but permit further opening of the damper by suction in the flue.

7. A draft control damper comprising a frame, a damper having a fulcrum rod for swingably mounting the damper in the frame, an angle arm pivotally mounted on said rod and including an extension, a portion of the arm being outside of the frame and the extension being inside the frame so that when the free end of the arm outside of the frame is moved in one direction the extension inside of the frame will push the top part of the damper outwardls to swing the bottom part inwardly a desired amount and also end of the arm will cause the extension to move the upper part of the damper free for further opening by suction in the smoke pipe, the arm and the damper having a common axis of rotation.

9. A draft control damper comprising a frame adapted to be mounted in an opening leading to a furnace smoke pipe, a damper swingably mounted in the frame, an angle arm rotatably mounted with relation to said frame and said damper and having an extension loosely contacting the inner face of the damper above its axis of rotation whereby upward movement of the free end of the arm will cause the extension to move the upper part of the damper free for further opening by suction in the smoke pipe, the fulcrum of said damper having a limited amount of rolling action forwardly and rearwardly of the frame as the damper is operated.

16. A draft control damper comprising a frame adapted to be mounted in an opening leading to a furnace smoke pipe, a damper swingably mounted in the frame, an angle arm rotatably mounted with relation to said frame and said damper and having an extension loosely contacting the inner face of the damper above its axis of rotation whereby upward movement of the free end of the arm will cause the extension to move the upper part of the damper free from further opening by suction in the smoke pipe.

ROBERT WILSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STPJFES PATENTS Firehammer May 5, 1942 

